Yep.
before I went mining in my T10 I had a T9.
Gotta say, the slots in the T9 are absolutely
perfect for a mining build.
You can fit everything perfectly, with no wasted slot capacity - no bunging, say, a 5A collector in a C6 slot etc.
If you fill all the hardpoints with mining lasers and run a G5 weapon-focused PDist, with 4 pips to weapons, it'll deplete a 'roid like a boss.
And, therein lies the problem.
There's no spare slots for any kind of defensive weapons... and, honestly, even if there was, the T9 can't turn fast enough to swat away an attacking Eagle or Adder easily.
At least that reduces the temptation to
fit defensive weapons, I suppose.
In use, if everything goes according to plan you can just enter a ring, hoover up ore and then head back to your FC.
If you need to jump out, though, (or you get disconnected) there'll usually be those magical pirates who manage to find you when you jump back in.
So, you're in a defenceless slug of a ship, with half a hold full of something expensive and you're forced to put your tail between your legs and scuttle back to your FC just because you've been attacked by something like an Eagle or an Adder.
My T9 was a better mining build than my T10 but the T10 also had space for a pair of large MCs and a pair of large beam lasers (while retaining the same mining lasers as the T9), which made me feel a bit more comfortable about flying around with a hold full of ore.
And, no.
I wasn't joking about just ramming 'roids at full speed in a Cutter.
It's a widely accepted tactic.
With your cargo hatch extended (7D thrusters, weapon focused PDist & 4 pips to weapons), you're only going to be doing around 100m/sec and a 6C bi-weave shield - supported by a bunch of SBs - can
easily soak up the hit.
And, as I said, the cargo hatch on the Cutter just happens to be in the perfect place to minimise limpet travel-time when the ship's nose is up against a 'roid.
FWIW, here's how I set up my Cutter when I went mining with it:
https://s.orbis.zone/qJQE
And, since I'm looking at Coriolis, here's how the other ships would look, by comparison...
T10:
https://s.orbis.zone/qJQK
T9:
https://s.orbis.zone/qJQL
Anaconda:
https://s.orbis.zone/qJQM
Corvette:
https://s.orbis.zone/qJQN
The T9 & T10 deliberately used A-rated thrusters to help give them a bit more agility.
They also had an ADC fitted so I wouldn't die of boredom while landing them.
I suppose you
could remove a couple of the defensive weapons from the T10 and fit a couple more mining lasers but, honestly, I always found the amount of lasers was a decent match for the number of collectors.
And, in the T10, it helped to have as much firepower as possible if I got attacked.
The Annie, 'vette and Cutter are all very similar, just with slight differences to fit the slots.
In the vette, in particular, (cos that's what I ended-up building) I never feel "vulnerable" with the huge MC/Beam for defence.
I've even destroyed pirates in Annies with it.
EDIT
While I'm at it, there are a couple of reasons why I've always stuck to 256t of cargo capacity for a heavy mining ship.
Firstly, 256t is (for me) a reasonable amount to mine without starting to get that "OMG, how much longer???!!!" feeling.
Secondly, 256t was the maximum amount you could fit in a shielded Python, so I could leave a Python at a nearby station, go mining, return to the station, swap to the Python and take the ore to market in a fairly agile, well-armed ship.
I guess the 2nd thing isn't as important now, with FCs and with the arrival of the T8, but it's still worth bearing in mind that you might, at some point, need to transfer cargo from a mining ship to a cargo ship.